config: update size information

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/archival/tar.c b/archival/tar.c
index 6950c27..3ef89fb 100644
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -23,7 +23,7 @@
  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
 //config:config TAR
-//config:	bool "tar (40 kb)"
+//config:	bool "tar (39 kb)"
 //config:	default y
 //config:	help
 //config:	tar is an archiving program. It's commonly used with gzip to